smythe



H. E. SMYTHE.

PREHEATING FURNACE.

APPLICATION man luLY a. 1919.

111322,208. Y Patented Nov. 18,1919.

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PREHEATING EURNACE.

APPLICATION FILED JULY 3, I9I9. 1,322,208. Patented Nov. 18,1919.

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INVENTORI n ---FME I -2- E En E n m., @E E UNTTED sTATEs PATENT oEEicE.

HORACE E. SMYTI-IE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 THE S. R. SMYTHE COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF WEST VIRGINIA.

To all whom t may concern:

Be it known that I, HORACE E. SMYTHE, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Preheating- Furnaces, of which the following is a specication. y

My invention relates to preheating furnaces, and more particularly to improvements in the preheating apparatus shown in my Patent No. 1,305,176, granted May 27, 1919.

The object of the present invention is to provide means for spacing and bracing the wall of the regenerating flues; to increase the area of the heat-absorbing surface; and to impede the flow of the gases and thereby increase the time for the absorption of their heat by the liues. Other objects appear hereinafter.

On the accompanying drawings, Figure 1 is a longitudinal vertical section of a furnace containing kmy invention, the section being taken on the line 1-1 of Fig. 3; Fig. 2, a horizontal section on the line II-II of Fig. 1; Fig. 3, a vertical cross-section on the line III-III of Fig. 1; and Fig. 4, a section of a portion of two adjacent walls and a few of the bracing and tying bricks or bars.

On the drawings, 1 designates a furnace chamber lying above two preheating chambers 2 and 3, separated by the wall 4 eXtending transversely of the furnace chamber. 5 represents the stack. 6 and 7 are two chambers on opposite sides of the stack, the former connected by the flue 8 to the opening 9 leading into the inner end of the chamber 2, and the latter connected by the flue 10 to the opening 11 into the inner end of the chamber 3. 1

Through the usual reversing valves, not shown, the chamber 6 at one time supplies air or gas to the preheating chamber 2 by way of the passage 8 and the opening 9 while the chamber 7 receives the waste gases from the chamber 3 by way of the opening 11 and passage 10 and delivers them to the stack 5. Upon reversal of the said valves the functions of the chamber 6, the passage 8, and the opening 9 on the one hand, and of the chamber 7, the passage 10, and the opening 11 on the other hand are reversed in the well known manner.

Specification of Letters Patent.

` Patented Nov. 18, 1919.

Application filed July 3, 1919. Serial N0. 308,386.

Beyond the bridge walls 12 and 13 at the opposite ends of the furnace chamber 1 are the vertical flues 14 and 15, the former leading to the outer end of the chamber 2 and the latter to the outer end of the chamber 3.

Beneath the flues 14 and 15 are the slagcleaning and repairing.

The structure within the chambers 2 and 3 is alike. Only that within the chamber 2 will be described. The portion of the chamber 2 between the walls 4 and 7 is provided with several vertical baies or walls 2O to 25, which except the baflies 20 and 25 start alternately from the opposite sides of the chamber and stop short of the opposite side, forming the flues 26 to 31 at the ends of the baflies. The baflies 20 and 25 do not reach' either side of the furnace, whereby the double parallel flues 32 and 33 are provided at the outer ends of the chamber 2, and similar iues 37 and 38 are provided at the inner end thereof. Single flues 34 to 36 are provided between the consecutive baiies 21 to 24. All the baffles extend from the floor of the chamber to the roof, there being small by-pass openings provided at the top and bottom.

The lateral walls of the iiues 32 to 38 are provided with horizontal bricks 39 having their ends in openings (Fig. 4) in the said walls. These bricks serve as girders for bracing and spacing the walls and tying them together. They also break up and ree tard the flow of the gases so as to give increased time for heating the heat-absorbing surfaces in the chamber, and they increase the 'area of the said heat-absorbing surfaces.

Supposing the chamber 6 to be connected to a supply of air and the chamber 7 to the stack 5, the air will flow from the chamber 6 through the passage 8, the opening 9, the flue 31, the ues 37 and 38 in parallel, the flues 30, 36, 29, 35, 28, and 34 in series, the fines 27, 32, 33, and 26, the port 18, and the flues 16 and 14 to the furnace chamber 1 where the air meets with a supply of gas which may be preheated in a similar manner, if preferred. From the chamber 1 the hot waste gases pass over the bridge-wall 13 and down the flue 15 to the right-hand pocket 16 where they drop slag and other heavy foreign matter. From the said pocket 16 the gases passtlirou'gh the' chan'iberB` after enteringby the port 18; The course of the gases through this chamber is the reverse of that just described for the air through the chamber 2. The gasesleave t-he chamber through the opening 11 and reach the stack 5 through the passage 10 andthe cl'rainbe'r 7. The gases passing through the chamber 3 highly heat all the surfacesalongy which theypass, the girders 39 absorbing a large amount of heat and slowing up thefflow of thegas'es.`

If now the reversing valves are'niovedl so5 astovopen the chamber (3- tothe stack 5l and the chamber 7- to the air supply, the air and waste gases will takeV the opposite' course tovv those taken before the valves were reversed. The air will be highly heated in passing throughthe chamber 3 and the waste gases from the furnace chamber will highly heat the chamber. 2.- When the valves are again reversed, the vair willvbe' heated bythe chaine ber 2 andy the waste gases will' heat thc chamber 3. The valves are alternately thrown' in opposite directionsat such intervals/of time as willbest heat the air and the preheating` chanrbers;

Numerous openingstOfar-e provided in the sidesV of thel chambers 2Y and 3' whereby nozzles ofk hose conveying air, Water or other cleaning medium may be applied to the interior walls andthe bracesV 39. These openings will ordinarily 'be closed during the normal use of the furnace.

I have not shown any apparatus for preheating fuel-gas. This may be accomplished by providing duplicate preheating chambers, reversing valves and gas passages .such as I have described for preheating air. 40 indicates openings for the entrance of fuel gas.-

I claim:

1. In a preheating structure for air,y gas, or the like, a= chamber' having an inlet and an outlet, and between the same a series of vertical baffles arising alternately from the sides'of the chamber and stopping short of the opposite sidethereof and also extending frointhefloor tothe roof thereof, andv braces connecting adjacent bafHes whereby the baffles are' kept in place, and the area of the heating` surfaces of the chamber increased.

2.' Ina preheating structure for air, gas, or the like, a chamber having an inlet and an outlet, and between the saine a series of vertical baflies arising alternately from the sides of thechamber and' stopping short of the opposite side thereof and also extending fronrthe hoor to the roof thereof, and braces connecting adjacent bailies whereby the baffles arel kept in place, and the area of the heating surfacesof the chamber increased.

Signed at Pittsburgh, Pa., this 23rdl day of June, 1919.

HORACE E. sMYTHE. 

